Add Wait* API to ActionRunner to wrap over WaitAction.

content/test/gpu/gpu_tests/context_lost.py

Index: content/test/gpu/gpu_tests/context_lost.py
diff --git a/content/test/gpu/gpu_tests/context_lost.py b/content/test/gpu/gpu_tests/context_lost.py
index a4913525e9634fa2a41f10c016a68f35d3625956..092747aa57956afc7e77b0e7d2dde7f03912b264 100644
--- a/content/test/gpu/gpu_tests/context_lost.py
+++ b/content/test/gpu/gpu_tests/context_lost.py
@@ -138,8 +138,8 @@ class WebGLContextLostFromGPUProcessExitPage(page.Page):
 
   def RunNavigateSteps(self, action_runner):
     action_runner.NavigateToPage(self)
-    action_runner.RunAction(WaitAction(
-      {'javascript': 'window.domAutomationController._loaded'}))
+    action_runner.WaitForJavaScriptCondition(
+        'window.domAutomationController._loaded')
 
 
 class WebGLContextLostFromLoseContextExtensionPage(page.Page):
@@ -155,8 +155,8 @@ class WebGLContextLostFromLoseContextExtensionPage(page.Page):
 
   def RunNavigateSteps(self, action_runner):
     action_runner.NavigateToPage(self)
-    action_runner.RunAction(WaitAction(
-      {'javascript': 'window.domAutomationController._finished'}))
+    action_runner.WaitForJavaScriptCondition(
+        'window.domAutomationController._finished')
 
 class WebGLContextLostFromQuantityPage(page.Page):
   def __init__(self, page_set, base_dir):
@@ -171,8 +171,8 @@ class WebGLContextLostFromQuantityPage(page.Page):
 
   def RunNavigateSteps(self, action_runner):
     action_runner.NavigateToPage(self)
-    action_runner.RunAction(WaitAction(
-      {'javascript': 'window.domAutomationController._loaded'}))
+    action_runner.WaitForJavaScriptCondition(
+        'window.domAutomationController._loaded')
 
 class ContextLost(test_module.Test):
   enabled = True
@@ -189,5 +189,3 @@ class ContextLost(test_module.Test):
     ps.AddPage(WebGLContextLostFromLoseContextExtensionPage(ps, ps.base_dir))
     ps.AddPage(WebGLContextLostFromQuantityPage(ps, ps.base_dir))
     return ps
-
-